Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed84517312847e0…

MALICIOUS

PDF

75.1 KB Created: 2021-02-21 17:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 17a6b7096ac4f51df7531d9d4afe814a SHA-1: 9e050b911b9c6cbf63564a2f0f32a95fc6176a7d SHA-256: 1ed84517312847e02f59e8924a3fa672bee0500cbbe8983ceab4b22ffc7d77c1
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/strik?utm_term=find+wordpress+username+and+password+in+database PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483362/normal_6031f29b2b5e5.pdfIn PDF document text
    • http://wspring.space/inside_out_and_back_again_short_summary022su.pdfIn PDF document text
    • http://websporizle3.com/cara_bermain_multiplayer_city_racing_3de11jw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482636/normal_5fdabd76c7f99.pdfIn PDF document text
    • https://jidedenevunuva.weebly.com/uploads/1/3/4/4/134498736/464cb.pdfIn PDF document text
    • https://sefositudixe.weebly.com/uploads/1/3/4/5/134524400/jomaniwifejuje_sujexojenolu.pdfIn PDF document text
    • https://xarupome.weebly.com/uploads/1/3/4/4/134469096/6197414.pdfIn PDF document text
    • https://gixefizavemo.weebly.com/uploads/1/3/4/1/134108956/pewapujolod_vaxifutovul_tefawe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426972/normal_5ff7cbadc7a36.pdfIn PDF document text
    • https://libadelalisam.weebly.com/uploads/1/3/4/5/134579317/561697.pdfIn PDF document text
    • https://lerojapozexux.weebly.com/uploads/1/3/4/0/134016693/0ca6dc05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483587/normal_602ec608f14e7.pdfIn PDF document text
    • https://bopunesarikimar.weebly.com/uploads/1/3/1/4/131453984/sepajilizomas-sogilamiwiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/dwarf_paladin_leveling_guide_vanilla.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/7000499016.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/14373784486.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/2114751537.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/gakabopoko.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96F 5260 bytes
SHA-256: f59e5811349133cc0ee802fb2fa7cb0d6ca10f25292fb949d9029f9343fbfbbc
font_01_sfnt_off0000fb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 10408 bytes
SHA-256: e3dcc5f912f6d1c6fdc6b74b00fe721b3e675095fdfffe4e50b755228104b8a3

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